Proteus pricing is simple $25* / user licence / month for full access to the Proteus OS, Xchange, The Marketplace and The Gateway.
If you are a Freelancer it is free to get an account, setup your profile and get it out there on the Marketplace.
If you are a Freelancer and you want a bit more, i.e. the ability to hook up with other Freelancers and run your virtual company then you get all this for only $25 a month.
*Proteus is free until the 31st of July 2020